CN219684717U - Positioning device - Google Patents

Abstract

The utility model provides a positioning device, which comprises a bearing component, a sleeve, a transmission component and a supporting piece, wherein the bearing component comprises a connecting piece and a bearing piece which are connected with each other, a containing cavity is arranged in the bearing piece, the containing cavity comprises a first cavity arranged along the axial direction of the bearing piece and a second cavity arranged along the radial direction of the bearing piece, the sleeve is slidably sleeved on the bearing piece, the transmission component comprises a joint piece positioned in the first cavity, a first elastic piece, a movable piece positioned in the second cavity and a second elastic piece, the second elastic piece is sleeved on the movable piece, and the supporting piece is connected with one end of the joint piece, which is far away from the first elastic piece. When the positioning device works, the abutting piece is firstly poked to abut against the coordinate origin on the workpiece, then the positioning device is driven by external processing equipment to move to the sleeve to fall, and the external processing equipment obtains the coordinates of the coordinate origin hole on the workpiece in the moving direction of the movable piece, so that the workpiece is rapidly positioned, and the positioning efficiency is improved.

Description

Positioning device

Technical Field

The utility model relates to the technical field of positioning, in particular to a positioning device.

Background

Before machining a workpiece, a probe is subjected to deflection correction, then the coordinate origin on the workpiece is detected for four times through the probe, then the central coordinates are calculated according to the four detected values, and finally the calculated central coordinates are input into a machining machine tool, so that the machining machine tool can machine the workpiece according to the central coordinates, and the workpiece is positioned. However, the deflection correction of the probe in this positioning manner takes a long time, and multiple measurements of the origin of the coordinates are required, so that the positioning efficiency of the workpiece is low.

Disclosure of Invention

In view of the foregoing, it is desirable to provide a positioning device that improves the positioning efficiency of a workpiece.

An embodiment of the present utility model provides a positioning device, including:

the bearing assembly comprises a connecting piece and a bearing piece which are connected with each other, wherein the connecting piece is used for connecting a machine table, a containing cavity is formed in the bearing piece, the containing cavity comprises a first cavity body axially arranged along the bearing piece and a second cavity body radially penetrating the bearing piece, and the second cavity body is communicated with the first cavity body;

the sleeve is sleeved on the bearing piece in a sliding manner;

the transmission assembly is arranged in the accommodating cavity and comprises a joint piece and a first elastic piece which are arranged in the first cavity, and a movable piece and a second elastic piece which are arranged in the second cavity, wherein the first elastic piece is arranged in the first cavity and is arranged between the joint piece and the bearing piece, the second elastic piece is arranged in the second cavity and is sleeved on the movable piece, and the joint piece is used for rotating when being pressed so as to drive the movable piece to move and extend out of the second cavity so as to limit the sleeve; a kind of electronic device with high-pressure air-conditioning system

And the abutting piece is connected with one end of the joint piece, which is away from the first elastic piece, and is used for abutting the workpiece.

When the positioning device works, the positioning device is firstly connected to external processing equipment (not shown) such as a processing machine tool through a connecting piece, the abutting piece is pushed to abut against a coordinate origin hole on a workpiece, the abutting piece extrudes the coordinate origin hole and generates acting force, the pushed abutting piece drives the joint piece to rotate under the driving of the reaction force generated by the coordinate origin hole, the joint piece drives the movable piece to compress the second elastic piece and slide out of the second cavity along the second cavity when rotating, so that the movable piece abuts against the lower end of the sleeve, then the positioning device is driven to move towards the positioning hole through the external processing equipment, the elastic force released by the compressed second elastic piece in the moving process of the positioning device pushes the movable piece to move towards the first cavity and pushes the joint piece to rotate, the movable piece and the joint piece are reset, and when the sleeve slides down under the action of gravity, the external processing equipment obtains the coordinate of the coordinate origin hole on the workpiece in the moving direction of the movable piece, so that the positioning of the workpiece is realized. Therefore, the workpiece is quickly positioned by stirring the supporting piece to support the coordinate origin on the workpiece, and then driving the positioning device to move to the sleeve to fall through the external processing equipment, and the external processing equipment obtains the coordinate of the coordinate origin hole on the workpiece in the moving direction of the movable piece, so that the positioning efficiency is improved.

In some embodiments, the articular component comprises:

one end of the first joint body, which is close to the first elastic piece, is rotationally connected with the cavity wall of the first cavity;

one end of the second joint body is connected with the other end of the first joint body, which is away from the first elastic piece, and is propped against the movable piece, and the other end of the second joint body is detachably connected with the propping piece.

In some embodiments, the first cavity includes a rotation cavity and a swing cavity in communication with each other, and the first joint body includes:

the first spherical head is rotationally arranged at one end, far away from the connecting piece, in the rotating cavity, the first elastic piece is accommodated in the rotating cavity, and two ends of the first elastic piece are respectively propped against the inner wall of the rotating cavity and the first spherical head;

the first connecting rod is arranged in the swinging cavity, one end of the first connecting rod is connected to one end of the first spherical head, which is away from the first elastic piece, and the other end of the first connecting rod is connected to the second joint body.

In some embodiments, a spherical groove is disposed at an end of the movable member facing the first cavity, the second joint body includes a second spherical head and a second connecting rod that are adapted to the spherical groove, the second connecting rod and the first joint body are connected to opposite sides of the second spherical head, and a portion of the second spherical head abuts against the spherical groove.

In some embodiments, the second cavity includes a sliding hole and a receiving groove that are mutually communicated, and the diameter of the receiving groove is larger than the diameter of the sliding hole, and the movable member includes:

a sliding part, one end of which abuts against the joint piece, and the other end of which slides in the sliding hole;

the protruding part is protruding to be located the sliding part is close to the one end of joint spare, the second elastic component is acceptd in the accepting groove and the cover is located the sliding part, the both ends of second elastic component support respectively in protruding part and the diapire of accepting groove.

In some embodiments, the number of the movable parts, the number of the second elastic parts and the number of the second cavities are the same and are all a plurality of, the second cavities are circumferentially arranged at intervals by taking the first cavity as an axis and are communicated with the first cavity, one second elastic part is sleeved on one movable part and is arranged in a corresponding second cavity, and one movable part is arranged in one second cavity.

In some embodiments, one end of the abutment is detachably connected to the other end of the second joint body, and the other end of the abutment is provided with a conical surface.

In some embodiments, the carrier assembly further comprises:

the top plate is detachably connected to one end of the bearing piece, which faces the connecting piece, and protrudes out of the bearing piece along the radial direction of the bearing piece, the connecting piece penetrates through the top plate, and the top plate is used for stopping one end of the sleeve;

the bottom plate is detachably connected to one end of the bearing piece, which is away from the connecting piece, and protrudes out of the bearing piece along the radial direction of the bearing piece, the joint piece penetrates through the bottom plate, and the bottom plate is used for stopping the other end of the sleeve.

In some embodiments, the carrier comprises:

the first supporting body is detachably connected to the top plate and the bottom plate and is connected to the connecting piece, and a part of the first cavity is arranged on the first supporting body separately;

the second supporting body is detachably connected to the bottom plate, the other part of the first cavity is arranged on the second supporting body separately, and the second supporting body is arranged on the first supporting body in a radial pasting mode.

In some embodiments, the second carrier is provided with a positioning slot, and the first carrier comprises:

a carrying part;

the extending part protrudes out of the bearing part along the radial direction of the bearing part and is provided with a positioning hole, the extending part is detachably connected with the top plate and is connected with the connecting piece, and one side, away from the bottom plate, of the second bearing body is attached to the extending part;

the positioning pin is sequentially inserted into the positioning hole and the positioning groove and used for positioning the second bearing body to the first bearing body.

Drawings

Fig. 1 is a schematic structural diagram of a workpiece according to an embodiment of the present utility model.

Fig. 2 is a schematic structural diagram of a positioning device according to an embodiment of the utility model.

Fig. 3 is an exploded view of the positioning device of fig. 2.

FIG. 4 is a cross-sectional view of the connector and carrier of FIG. 3 taken along the direction IV-IV.

Fig. 5 is an exploded view of the transmission assembly and the abutment in fig. 3.

Fig. 6 is an exploded view of the carrier assembly of fig. 2.

Description of the main reference signs

Positioning device 10

Bearing assembly 11

Connecting piece 111

Carrier 112

First carrier 1121

A carrier 1121a

Extension 1121b

Locating pin 1121c

Positioning hole 1121d

Second carrier 1122

Positioning groove 1123

Accommodation chamber 113

First cavity 1131

Rotating cavity 1131a

Swing cavity 1131b

Second cavity 1132

Slide hole 1132a

Receiving groove 1132b

Top plate 114

Bottom plate 115

Sleeve 12

Transmission assembly 13

Joint member 131

First joint body 1311

First ball head 1311a

First connecting rod 1311b

Second joint body 1312

Second ball-shaped head 1312a

Second connecting rod 1312b

Movable member 132

Sliding portion 1321

Projection 1322

Ball groove 1323

First elastic member 133

Second elastic piece 134

Holding piece 14

Conical surface 141

Workpiece 20

Origin of coordinates hole 21

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present utility model and are not to be construed as limiting the present utility model.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a workpiece 20, and a coordinate origin hole 21 is formed in the workpiece 20. Illustratively, the workpiece 20 may be a cell phone component.

Referring to fig. 2, an embodiment of the present utility model provides a positioning device 10, which includes a bearing assembly 11, a sleeve 12, a transmission assembly 13, and a supporting member 14. Referring to fig. 3 and 4, the bearing assembly 11 includes a connecting member 111 and a bearing member 112 that are connected to each other, the connecting member 111 is used for connecting to a machine, a receiving cavity 113 is disposed inside the bearing member 112, the receiving cavity 113 includes a first cavity 1131 disposed along an axial direction of the bearing member 112 and a second cavity 1132 disposed along a radial direction of the bearing member 112, the second cavity 1132 is communicated with the first cavity 1131, the sleeve 12 is slidably sleeved on the bearing member 112, the transmission assembly 13 includes a joint member 131 and a first elastic member 133 disposed in the first cavity 1131, and a movable member 132 and a second elastic member 134 disposed in the second cavity 1132, the first elastic member 133 is disposed between the joint member 131 and the bearing member 112, the second elastic member 134 is disposed in the second cavity 1132 and sleeved on the movable member 132, the joint member 131 is used for driving the movable member 132 to move and extend out of the second cavity 1132 under compression to limit the sleeve 12, and the supporting member 14 is connected to one end 20 of the joint member 131 facing away from the first elastic member 133 for supporting the workpiece 133.

When the positioning device 10 works, the positioning device is firstly connected to an external processing device (not shown) such as a processing machine tool through the connecting piece 111, and the abutting piece 14 is pushed to abut against the coordinate origin hole 21 on the workpiece 20, the abutting piece 14 extrudes the coordinate origin hole 21 and generates a force, the pushed abutting piece 14 drives the joint piece 131 to rotate under the driving of the reaction force of the coordinate origin hole 21, the joint piece 131 rotates to drive the movable piece 132 to compress the second elastic piece 134 and slide along the second cavity 1132 until the second cavity 1132 extends out, so that the movable piece 132 abuts against the lower end of the sleeve 12, then the positioning device 10 is driven by the external processing device to move towards the positioning hole 1121d, the elastic force released by the compressed second elastic piece 134 in the moving process of the positioning device 10 pushes the movable piece 132 towards the first cavity 1131 and pushes the joint piece 131 to rotate until the movable piece 132 and the joint piece 131 reset, and the sleeve 12 slides down under the action of gravity, and the external processing device obtains the workpiece 20 with the coordinate origin hole 21 moving in the moving direction of the movable piece 132. In this way, the workpiece 20 is rapidly positioned by stirring the propping piece 14 to prop against the coordinate origin on the workpiece 20, then driving the positioning device 10 to move to the sleeve 12 to fall through the external processing equipment, and the external processing equipment obtains the coordinates of the coordinate origin hole 21 on the workpiece 20 in the moving direction of the movable piece 132, so that the positioning efficiency and the subsequent further processing production efficiency are improved.

Referring to fig. 5, in some embodiments, the joint member 131 includes a first joint body 1311 and a second joint body 1312, wherein one end of the first joint body 1311 near the first elastic member 133 is rotatably connected to a cavity wall of the first cavity 1131, one end of the second joint body 1312 is connected to the other end of the first joint body 1311 facing away from the first elastic member 133 and abuts against the movable member 132, and the other end of the second joint body 1312 is detachably connected to the abutting member 14.

In this way, the first joint body 1311 is rotatably disposed in the first cavity 1131, so as to realize the rotational connection between the joint member 131 and the carrier 112, and the structure is simple, and the multi-directional rotation can be realized, so that the second joint body 1312 and the supporting member 14 can be detachably connected, so as to facilitate the detachment or the installation of the supporting member 14.

Referring to fig. 4, in some embodiments, the first cavity 1131 includes a rotation cavity 1131a and a swinging cavity 1131b that are mutually communicated, the first joint body 1311 includes a first spherical head 1311a and a first connecting rod 1311b, the first spherical head 1311a is rotatably disposed at one end of the rotation cavity 1131a far away from the connecting member 111, the first elastic member 133 is accommodated in the rotation cavity 1131a, two ends of the first elastic member 133 respectively support against an inner wall of the rotation cavity 1131a and the first spherical head 1311a, the first connecting rod 1311b is disposed in the swinging cavity 1131b, one end of the first connecting rod 1311b is connected to one end of the first spherical head 1311a facing away from the first elastic member 133, and the other end of the first connecting rod 1311b is connected to the second joint body 1312. In this embodiment, the swing cavity 1131b is tapered to provide a space for movement for the rotation of the second joint body 1312.

In this way, the first spherical head 1311a rotates in the rotating cavity 1131a, so that the first joint body 1311 can rotate in multiple directions, the structure is simple, the installation is convenient, the first elastic piece 133 elastically abuts against the first spherical head 1311a by the arrangement of the first elastic piece 133, the first spherical head 1311a is flexibly limited, and abrasion of the first spherical head 1311a to the cavity wall of the rotating cavity 1131a is reduced.

Referring to fig. 5, in some embodiments, a spherical groove 1323 is disposed at an end of the movable member 132 facing the first cavity 1131, the second joint body 1312 includes a second spherical head 1312a and a second connecting rod 1312b, which are matched with the spherical groove 1323, the second connecting rod 1312b and the first joint body 1311 are connected to opposite sides of the second spherical head 1312a, and a portion of the second spherical head 1312a abuts against the spherical groove 1323.

In this way, by abutting the second spherical head 1312a against the groove wall of the spherical groove 1323 on the movable member 132, surface contact is achieved between the movable member 132 and the second joint body 1312, increasing the contact area between the movable member 132 and the second joint body 1312, so that wear between the second joint body 1312 and the spherical groove 1323 is reduced when the second joint body 1312 rotates and moves relative to the movable member 132.

In some embodiments, the second cavity 1132 includes a sliding hole 1132a and a receiving groove 1132b that are mutually communicated, the diameter of the receiving groove 1132b is larger than that of the sliding hole 1132a, the movable member 132 includes a sliding portion 1321 and a protruding portion 1322, one end of the sliding portion 1321 abuts against the joint member 131, the other end of the sliding portion 1321 slides in the sliding hole 1132a, the protruding portion 1322 is protruding at one end of the sliding portion 1321 near the joint member 131, the second elastic member 134 is received in the receiving groove 1132b and sleeved on the sliding portion 1321, and two ends of the second elastic member 134 abut against bottom walls of the protruding portion 1322 and the receiving groove 1132b, respectively.

In this way, the second elastic member 134 is sleeved on the sliding portion 1321, then the sliding portion 1321 sleeved with the second elastic member 134 is inserted into the sliding hole 1132a, the second elastic member 134 and the protruding portion 1322 are located in the accommodating groove 1132b, so that the installation of the second elastic member 134 and the movable member 132 is completed, the structure is simple and easy to install, and meanwhile, the sliding portion 1321 is slidably connected with the sliding hole 1132a, so that the sliding portion 1321 is guided to move along the extending direction of the sliding hole 1132a, and the stability of the sliding portion 1321 during moving is improved.

Referring to fig. 3, in some embodiments, the number of the movable members 132, the number of the second elastic members 134, and the number of the second cavities 1132 are the same, and the second cavities 1132 are circumferentially spaced around the first cavity 1131 and are communicated with the first cavity 1131, and a second elastic member 134 is sleeved on a corresponding movable member 132 and is disposed in a corresponding second cavity 1132, and a movable member 132 is disposed in a second cavity 1132.

In this way, the plurality of movable members 132, the second elastic member 134 and the second cavity 1132 are provided, so as to position the workpiece 20 in a plurality of directions, thereby improving the positioning accuracy of the workpiece 20.

In the present embodiment, the number of the movable members 132, the second elastic members 134 and the second cavities 1132 is the same and four, and the four movable members 132, the second elastic members 134 and the second cavities 1132 are circumferentially and uniformly spaced around the first cavity 1131.

Referring to fig. 5, in some embodiments, one end of the abutment 14 is detachably connected to the other end of the second joint body 1312, and the other end of the abutment 14 is provided with a tapered surface 141.

In this way, the conical surface 141 is provided at the other end of the abutting piece 14, so that the abutting piece 14 can extend into the origin holes 21 with different diameters, thereby realizing positioning of the workpiece 20 with the origin holes 21 with different diameters, and improving the applicability of the positioning device 10.

Referring to fig. 6, in some embodiments, the bearing assembly 11 further includes a top plate 114 and a bottom plate 115, the top plate 114 is detachably connected to an end of the bearing 112 facing the connecting member 111 and protrudes from the bearing 112 along a radial direction of the bearing 112, the connecting member 111 penetrates the top plate 114, the top plate 114 is used for stopping one end of the sleeve 12, the bottom plate 115 is detachably connected to an end of the bearing 112 facing away from the connecting member 111 and protrudes from the bearing 112 along a radial direction of the bearing 112, the joint member 131 penetrates the bottom plate 115, and the bottom plate 115 is used for stopping the other end of the sleeve 12.

When the sleeve 12 is sleeved on the outer periphery of the bearing member 112, the top plate 114 and the bottom plate 115 are respectively located at two opposite sides of the sleeve 12, so that the sleeve 12 is stopped and limited while the movable space of the sleeve 12 is ensured in the axial direction of the bearing member 112, and the sleeve 12 is prevented from being separated from the bearing member 112.

Referring to fig. 6, in some embodiments, the carrier 112 includes a first carrier 1121, the first carrier 1121 is detachably connected to the top plate 114 and the bottom plate 115 and connected to the connecting member 111, a portion of the first cavity 1131 is disposed on the first carrier 1121, the second carrier 1122 is detachably connected to the bottom plate 115, another portion of the first cavity 1131 is disposed on the second carrier 1122, and the second carrier 1122 is radially attached to the first carrier 1121.

Because the second cavity 1132 includes the sliding hole 1132a and the receiving groove 1132b that are mutually communicated, and the diameter of the receiving groove 1132b that is close to the first cavity 1131 is larger than the diameter between the sliding grooves, the carrier 112 with the circular cross section is configured as the first carrier 112 and the second carrier 112 with the semicircular cross section, so that the processing of the second cavity 1132 formed on the carrier 112 is more convenient and faster, and the processing efficiency of the positioning device 10 is improved.

Referring to fig. 6, in some embodiments, the second carrier 1122 is provided with a positioning slot 1123, the first carrier 1121 includes a carrier 1121a, an extension 1121b and a positioning pin 1121c, the extension 1121b protrudes from the carrier 1121a along a radial direction of the carrier 1121a and is provided with a positioning hole 1121d, the extension 1121b is detachably connected to the top plate 114 and is connected with the connecting piece 111, one side of the second carrier 1122 facing away from the bottom plate 115 is attached to the extension 1121b, and the positioning pin 1121c is sequentially inserted into the positioning hole 1121d and the positioning slot 1123 for positioning the second carrier 1122 onto the first carrier 1121.

In this way, when the second carrier 1122 is attached to the first carrier 1121, the positioning pins 1121c are sequentially inserted into the positioning holes 1121d on the first carrier 1121 and the positioning grooves 1123 on the second carrier 1122, so as to realize the positioning between the second carrier 1122 and the first carrier 1121, so that the precision is higher when the first cavity 1131 on the first carrier 1121 and the first cavity 1131 on the second carrier 1122 are close to each other, and the assembly precision between the first carrier 1121 and the second carrier 1122 is improved.

The operation of the positioning device 10 is generally as follows:

first, the connecting piece 111 is connected to a tool holder on an external processing device to realize the installation of the positioning device 10, and the processing device drives the positioning device 10 to move to the vicinity of the origin hole 21 of coordinates on the workpiece 20;

then, the abutting piece 14 is shifted to be inserted into the coordinate origin hole 21 on the workpiece 20, the abutting piece 14 drives the joint piece 131 to rotate in the shifting process of the abutting piece 14, the joint piece 131 pushes the corresponding movable piece 132 to extend out of the second cavity 1132, and one end of the movable piece 132 extending out of the second cavity 1132 abuts against the lower end of the sleeve 12;

finally, the machining apparatus drives the positioning device 10 to move towards the rotation direction of the joint member 131, and when each second elastic member 134 pushes the corresponding movable member 132 to be completely retracted into the second cavity 1132 and the sleeve 12 falls down, the machining apparatus obtains the coordinates of the origin hole 21, so as to position the workpiece 20.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Finally, it should be noted that the above-mentioned embodiments are merely for illustrating the technical solution of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present utility model without departing from the spirit and scope of the technical solution of the present utility model.

Claims (10)

1. A positioning device, comprising:

the bearing assembly comprises a connecting piece and a bearing piece which are connected with each other, wherein the connecting piece is used for connecting a machine table, a containing cavity is formed in the bearing piece, the containing cavity comprises a first cavity body axially arranged along the bearing piece and a second cavity body radially penetrating the bearing piece, and the second cavity body is communicated with the first cavity body;

the sleeve is sleeved on the bearing piece in a sliding manner;

the transmission assembly is arranged in the accommodating cavity and comprises a joint piece and a first elastic piece which are arranged in the first cavity, and a movable piece and a second elastic piece which are arranged in the second cavity, wherein the first elastic piece is arranged in the first cavity and is arranged between the joint piece and the bearing piece, the second elastic piece is arranged in the second cavity and is sleeved on the movable piece, and the joint piece is used for rotating when being pressed so as to drive the movable piece to move and extend out of the second cavity so as to limit the sleeve; a kind of electronic device with high-pressure air-conditioning system

And the abutting piece is connected with one end of the joint piece, which is away from the first elastic piece, and is used for abutting the workpiece.

2. The positioning device of claim 1 wherein said articular component comprises:

one end of the first joint body, which is close to the first elastic piece, is rotationally connected with the cavity wall of the first cavity;

one end of the second joint body is connected with the other end of the first joint body, which is away from the first elastic piece, and is propped against the movable piece, and the other end of the second joint body is detachably connected with the propping piece.

3. The positioning device of claim 2 wherein said first cavity comprises a rotating cavity and a swinging cavity in communication with each other, said first joint body comprising:

the first spherical head is rotationally arranged at one end, far away from the connecting piece, in the rotating cavity, the first elastic piece is accommodated in the rotating cavity, and two ends of the first elastic piece are respectively propped against the inner wall of the rotating cavity and the first spherical head;

the first connecting rod is arranged in the swinging cavity, one end of the first connecting rod is connected to one end of the first spherical head, which is away from the first elastic piece, and the other end of the first connecting rod is connected to the second joint body.

4. A positioning device as claimed in claim 2, wherein,

the movable piece is provided with the ball groove towards one end of first cavity, the second joint body include with the second spherical head and the second connecting rod of ball groove looks adaptation, the second connecting rod with first joint body connect in the relative both sides of second spherical head, just a part of second spherical head support hold in the ball groove.

5. The positioning device of claim 1, wherein the second cavity includes a sliding hole and a receiving groove that are in communication with each other, and the diameter of the receiving groove is larger than the diameter of the sliding hole, and the movable member includes:

a sliding part, one end of which abuts against the joint piece, and the other end of which slides in the sliding hole;

the protruding part is protruding to be located the sliding part is close to the one end of joint spare, the second elastic component is acceptd in the accepting groove and the cover is located the sliding part, the both ends of second elastic component support respectively in protruding part and the diapire of accepting groove.

6. The positioning device of claim 1 wherein,

the number of the movable pieces, the second elastic pieces and the second cavities are the same and are multiple, the second cavities are circumferentially arranged at intervals by taking the first cavity as an axis and are communicated with the first cavity, one second elastic piece is sleeved on one corresponding movable piece and is arranged in one corresponding second cavity, and one movable piece is arranged in one second cavity.

7. A positioning device as claimed in claim 2, wherein,

one end of the abutting piece is detachably connected to the other end of the second joint body, and a conical surface is arranged at the other end of the abutting piece.

8. The positioning device of claim 1 wherein said carrier assembly further comprises:

the top plate is detachably connected to one end of the bearing piece, which faces the connecting piece, and protrudes out of the bearing piece along the radial direction of the bearing piece, the connecting piece penetrates through the top plate, and the top plate is used for stopping one end of the sleeve;

the bottom plate is detachably connected to one end of the bearing piece, which is away from the connecting piece, and protrudes out of the bearing piece along the radial direction of the bearing piece, the joint piece penetrates through the bottom plate, and the bottom plate is used for stopping the other end of the sleeve.

9. The positioning device of claim 8 wherein said carrier comprises:

the first supporting body is detachably connected to the top plate and the bottom plate and is connected to the connecting piece, and a part of the first cavity is arranged on the first supporting body separately;

the second supporting body is detachably connected to the bottom plate, the other part of the first cavity is arranged on the second supporting body separately, and the second supporting body is arranged on the first supporting body in a radial pasting mode.

10. The positioning device of claim 9 wherein said second carrier is provided with a positioning slot and said first carrier comprises:

a carrying part;

the extending part protrudes out of the bearing part along the radial direction of the bearing part and is provided with a positioning hole, the extending part is detachably connected with the top plate and is connected with the connecting piece, and one side, away from the bottom plate, of the second bearing body is attached to the extending part;

the positioning pin is sequentially inserted into the positioning hole and the positioning groove and used for positioning the second bearing body to the first bearing body.